The Bronx mom whose 3-year-old son ignited a fire that killed a dozen people bolted the burning building without alerting residents to the fast-spreading inferno, her next-door neighbor charged Saturday.

“She did not yell,” recalled an aggravated Shevon Stewart, 44, who lost four family members in the Thursday night blaze. “You (are) the one, and you don’t call for help? ...

“Call somebody! If you don’t have a phone, knock on a door. Do something!”

Mensah, 28, was found dead in a fourth-floor apartment, one story away from the apartment where he was staying.

The blaze also claimed three members of another immigrant family.

Solomon Donkor (l.), 49, his17-year-old daughter Hannah (r.) and his son William, 12, not pictured, were killed in Thursday night's inferno. The children had come from Ghana two months ago to live with their father.

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Solomon Donkor, 49, his 17-old-daughter Hannah Adoma Donkor and his 12-year-old son William Donkor were found dead in apartment 19. The two kids arrived last month from Ghana to live with their dad.

Their deaths devastated family in their homeland.

“The whole neighborhood is in mourning and disbelief,” said Smith Acquah, Donkor’s nephew.

The dead man’s wife learned of the tragedy on Friday. “She’s devastated,” Acquah said. “Those were the only children she had.”

Family and friends describe Donkor as a kind-hearted and generous businessman who sacrificed being with his young children in the early 2000s to come to the United States and make a better life for them.

“When he left, they were young,” Acquah explained. “He wanted them to come stay with him so they could go to school in the U.S.”

Donkor planned to visit Ghana in January and promised to help his nephew start his own business.

“And now you see what some reckless people did to us,” Acquah said. “Someone took the light away from my life.”